Four tug boats are having a contest to see who is strongest. Each boat attaches a rope to a very strong metal ring. Tugboat a head due north and pulls with a force of 300,000 lb , Tugboat b heads due south with a force of 250,000. Tugboat c heads due east with a force of 350,000. Tugboat d heads due west with a force of 275,000. What is the magnitude and direction of the resultant force?